Dynamo-electric generator.



Patented Aug. 20, l90l.

" B. a. LAMME. DYNAMO ELECTRIC GENERATOR.

(Application filed June 28, 1

WITNESSES:

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BENJAMIN G. LAMME, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THEWESTINGHOUSE ELECTRIC dz MANUFACTURING COMPANY, OF PENN- SYLVANIATDYNAlVlO-ELECTRIC GENERATOR.

SPECIFICATION forming part of Letters Patent No. 680,793, dated August20, 1901 Serial No. 22,003. (No model.)

To all whom it may concern.-

Be it known that I, BENJAMIN G. LAMME, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State of 5Pennsylvania, have invented new and useful Improvements inDynamo-Electric Generators, of which the following is a specification.

My invention relates to dynamo-electric generators, and particularly tomachines of [0 this character employed for generating alternatingcurrents.

The object of my invention is to provide a generator of the type aboveindicated which shall have certain advantages over those here- 15 toforedesigned and employed in similar relations. Among such advantages arethe utilization of an armature which has a large number of slots and asmall number of conductors per circuit; one which may have as 20 manycircuits in parallel as may be desired without regard to the number offield-magnet poles; one in which each circuit is uniformly distributedentirely around the armature periphery; one in which the coils are socon- 2 5 structed and arranged that in case of accident to any windingthe remaining windings will be uniformly distributed and may thereforebe used satisfactorily; one in which the windings may be usedindependently for separate o circuits, if desired; one in which part ofthe windings may be reversed when the number of circuits is an oddnumber, so as to provide a symmetrical arrangement, and one in which thedifference of potential between adjacent 3 5 end conductors is less thanthat between the end conductors of any one of the windings that arenearest to each other.

In order to secure the advantages above enumerated, I provide the meansshown in 0 the accompanying drawing, the single figure of which is adiagrammatic view of an armature and portions of the pole-pieces of thefield-magnet of a two-phase alternating-current generator, thepole-pieces being indilarger number of pole-pieces will be employed, itbeing well understood that in alter hating-current generators acomparatively large numberof pole-pieces of relatively small width isdesirable in order to secure the desired rate of alternations Withoutrunning the armature at an excessively high speed.

The armature A will in practice preferably be of the drum type, havingslots extending parallel to its axis and of sufficient depth to receivethe coils, the portions of the coils located at the ends of the armatureand outside of the slots being either formed as integral continuationsof the conductorslocated in the slots or beingin the form of connectorsbolted or riveted and soldered to the ends of the conductors whichprojectfrom the slots, as may be found convenient and desirable, bothforms of winding being well known in the art.

In order that the winding may be clearly illustrated, I have indicatedthe core-slots and the conductors located therein by radial linesdesignated, respectively, by the numerals 1 to 48, inclusive. Theseconductors 1 to 48 are connected at the respective ends of thearmature-core by end conductors, which, as hereinbefore stated, may beeither sepa rate connectors or integral parts of the slotconductors, soas to form a plurality of independent closed coil-windings, three ofthese windings being embodied in the machine illustrated in the drawing.The three windings O, O, and C are indicated by lines of differentwidth, and all are connected to gether in parallel at the brushes B bymeans of wires a a a 17 1) b 0 c 0 and d d d and the correspondingcollector-rings a 5 c and 01 It will be observed that the conductors ofthe several windings are so disposed and connected that conductorssubjected to the same magnetic conditions are joined to the samecollector-ring, and consequently that the machine is in perfect balanceelectrically and magnetically, and since each of the windings issymmetrically distributed about the armature if any one of the windingsbecomes disabled or destroyed the operation of the others will-not bedisturbed.

It will be understood without further illustration that my invention isequally well adapted for use in connection with generators havingstationary armatu res and rotary IOO fieldmagnets, such machines beingwell known in the art.

\Vhile I have shown my invention as applied to a generator of two-phasecurrents, I desire it to be understood that it is applicable to and maybe used in connection with generators of single-phase currents, or ofcurrents the phases of which are greaterin number than two.

I claim as my invention- I. An alternating-current dynamo-electricgenerator having an armature provided with a plurality of independent,closed coil-windings uniformly distributed around a single core andconnected in parallel to the distributing circuit or circuits.

2. An alternating-currentdynamo-electric generator having an armatureprovided with a plurality of closed coil-windings uniformly distributedaround a single core and symmetrically-disposed leads for connectingsaid windings together in parallel at the distributing-circuitterminals.

3. An altcrnating-cnrrent dynamo-electric generator having a pluralityof armature- Windings uniformly distributed around a single core, eachof which is closed upon itself and all of which are connected togetherin parallel at the distributing-circuit terminals.

4. An alternating-current dynamo-electric generator having an armatureprovided with a plurality of symmetricallydistributed, closedcoil-windings and with means for connecting to the terminals in parallelsuch points in the several windings as have substantially the samerelation to the poles of the magnetic field of the machine.

5. A polyphase dynamo-electric generator having a plurality of closedcoil-windings symmetrically disposed and a plurality of terminals towhich said windings are connected in parallel.

In testimony whereof I have hereunto subscribed my name this 26th day ofJune, 1900.

BENJ. G. LAHME. i/Vitnesses:

WEsLEY G. CARR,

HRNEY limits.

